I saw this information from Apple somewhere in the forum but I just wanted to put it out here. To see if other players having same problem.
1)Orb walking is not perfect, needs to have improvement (stuttering occurs) = True
2)Apparently users are also complaining the orb walker doesn't helps them to attack champions as well = Well it does attack but sometimes stops or it does not auto attack as fast as even clicking with the mouse and your like come one last hit him 2 seconds pass and you end up dying and not killing your target because the last hit didn't trigger . It shows like you froze, instead of keep going. Happens often and the problem has to be with the harassment feature.